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Aqueous surface chemistry of asbestos minerals.

Authors

Smith-RW

Source

University of Nevada, Reno, Nevada, 1973 Apr; :1-18

Link

NIOSHTIC No.

00033499

Abstract

Physicochemical study of the manner in which hydroxyl and other ions leave the surfaces of asbestos mineral as a function of aging time in water. In relatively pure water systems a parallelism is noted between magnesium dissolution and pH change for all asbestos minerals studied. The magnesium and hydroxyl dissolution reactions are diffusion controlled. Silica is more readily dissolved from crocidolite than from either chrysotile or amosite. Electrokinetic work shows that chrysotile placed in water initially has a surface approaching that of pure magnesium hydroxide, but after long aging in water the surface approaches that of nonasbestiform serpentine. Attempts made to relate pretreatment of asbestos fibers to carcinogenicity and fibrogenicity indicate that chrysotile appears more likely to induce tumors in rats than acid treated chrysotile or other asbestos minerals.